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Created by Matthieu Dorier@mdorierOwner

Protecting margo timers

In margo-timer.c, the static structures are not protected:

static int timer_inst_table_size = 0;
static struct margo_timer_instance *timer_inst_table[MAX_TIMER_INSTANCES] = {NULL};

This can lead to data race if multiple ES try to create a timer at the same time. We should also get rid of this hard-coded limitation MAX_TIMER_INSTANCES.